Washington County, Idaho
Washington County, Idaho, has 11,583 residents (July 2025 estimate). Its county seat is Weiser. It uses Mountain Time and covers 1,453 sq mi (3,763 km²) of land.
- Resident population, July 2025
- 11,583
- Land area
- 1,453 sq mi (3,763 km²)
- County seat or government
- Weiser
- Time zone
- Mountain TimeUTC-07:00 in January; UTC-06:00 in July
- Median household income
- $54,000 ± $7,096
- Median home value
- $278,100 ± $20,061
- Median rent, with utilities
- $938 ± $42
- Homes lived in by their owners
- 74.6% ± 3.6 points
- County type
- County
- Metro or micro area
- Outside any metro or micro areaNext to: Ontario, OR-ID micro area, Baker City, OR micro area, and Boise City, ID metro area
- Water area
- 20.5 sq mi (53.2 km²)
- State
- Idaho
- County code (FIPS)
- 16087
- Coordinates (central point)
- 44.448223, -116.797792
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Washington County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Mountain TimeAmerica/Boise | UTC-07:00 in January; UTC-06:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
5 ZIP Code areas overlap Washington County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
Washington County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Washington County, largest first
- Payette Joint School District 37111,298 people
- Weiser School District 4319,019 people
- Cambridge Joint School District 4321,674 people
- Midvale School District 433998 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Weiser, Idaho (city)5,935 people
- Midvale, Idaho (city)347 people
- Cambridge, Idaho (city)324 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Payette County, Idaho31 mi south
- Gem County, Idaho33 mi southeast
- Adams County, Idaho34 mi northeast
- Baker County, Oregon47 mi west
- Malheur County, Oregon96 mi southwest
Before using this answer on a form
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